Bihar PSC: BPSC 2018 Answer Key | Solved Paper

BPSC 2018 Answer Key | BPSC 2018 Solved Paper

1. Which of the following has pH value 7?
A. Pure water
B. Neutral solution
C. Basic solution
D. Acidic solution
E. None of the above/More than one of the aboveAnswer. More than one of the above

If the pH of a solution is less than 7, the solution is called acidic; if the pH is about 7, the solution is neutral; if the pH is greater than 7, the solution is is called basic. In an acidic solution, then, the concentration of hydrogen ions is greater than the concentration of hydroxide ions.The pH of pure water is 7. In general, water with a pH lower than 7 is considered acidic, and with a pH greater than 7 is considered basic. The normal range for pH in surface water systems is 6.5 to 8.5, and the pH range for groundwater systems is between 6 to 8.5.

2. Which of the following elements does not contain neutrons?
A. Oxygen
B. Nitrogen
C. Hydrogen
D. Copper
E. None of the above/More than one of the aboveAnswer. Hydrogen

Hydrogen is a chemical element with symbol H and atomic number 1. With a standard atomic weight of 1.008, hydrogen is the lightest element on the periodic table. Its monatomic form (H) is the most abundant chemical substance in the Universe, constituting roughly 75% of all baryonic mass. Non-remnant stars are mainly composed of hydrogen in the plasma state. The most common isotope of hydrogen, termed protium (name rarely used, symbol1H), has one proton and no neutrons.

3. Angstrom is a unit of
A. wavelength
B. energy
C. frequency
D. velocity
E. None of the above/More than one of the aboveAnswer. Wavelength

An angstrom or ångström is a unit of length used to measure very small distances. One angstrom is equal to 10−10 m (one ten-billionth of a meter or 0.1 nanometers).

4. Frequency is measured in
A. hertz
B. meter/ second
C. radian
D. watt
E. None of the above/More than one of the aboveAnswer. Hertz

5. Who discovered DNA?
A. James Watson and Francis Crick
B. Gregor Mendel
C. Johannsen
D. Hargovind Khorana
E. None of the above/More than one of the aboveAnswer. James Watson and Francis Crick

James Dewey Watson (born April 6, 1928) is an American molecular biologist, geneticist and zoologist, best known as one of the co-discoverers of the structure of DNA in 1953 with Francis Crick. Watson, Crick, and Maurice Wilkins were awarded the 1962 Nobel Prize in Physiology or Medicine "for their discoveries concerning the molecular structure of nucleic acids and its significance for information transfer in living material".

6. What is triglyceride?
A. Protein
B. Carbohydrate
C. Fat
D. Mineral
E. None of the above More than one of the aboveAnswer. Fat

Triglycerides are a type of fat (lipid) found in your blood. When you eat, your body converts any calories it doesn't need to use right away into triglycerides. The triglycerides are stored in your fat cells. Later, hormones release triglycerides for energy between meals.

7. Electroencephalogram (EEG) is used in monitoring
A. heart
B. liver
C. pancreas
D. brain
E. None of the above/More than one of the aboveAnswer. Brain

An electroencephalogram (EEG) is a test that detects electrical activity in your brain using small, metal discs (electrodes) attached to your scalp. Your brain cells communicate via electrical impulses and are active all the time, even when you're asleep.

8. Body temperature is regulated by
A. thalamus
B. hypothalamus
C. cerebellum
D. medulla
E. None of the above/More than one of the aboveAnswer. Hypothalamus

The hypothalamus is a small region of the brain. It's located at the base of the brain, near the pituitary gland. While it's very small, the hypothalamus plays a crucial role in many important functions, including releasing hormones. regulating body temperature.

9. Choose the correct statement.
A. Wavelength of red light is less than violet light.
B. Wavelength of red light is more than violet light.
C. Wavelength of violet light is more than green light.
D. Wavelength of violet light is more than yellow light.
E. None of the above/More than one of the aboveAnswer. Wavelength of red light is more than violet light.

Red light has the highest wavelength. It is situated extremely right side of visible light on the electromagnetic spectrum. But has lowest frequency.Violet has the highest frequency and the shortest wavelength of the visible colors of light

11. The unit of electric power is
A. ampere
B. volt
C. coulomb
D. watt
E. None of the above/More than one of the aboveAnswer. Watt

Electric power is the rate, per unit time, at whichelectrical energy is transferred by an electric circuit. The SI unit of power is the watt, one joule per second. Electric power is usually produced byelectric generators, but can also be supplied by sources such as electric batteries.

12. In electrical motor
A. heat is converted into electrical energy
B. electrical energy is converted into heat
C.electrical energy is converted into mechanical energy
D. mechanical energy is converted into electrical energy
E. None of the above/More than one of the aboveAnswer. electrical energy is converted into mechanical energy

13. Human body contains
A. about 70% water
B. 20%-30% water
C. 10%-20% water
D. 30%-40% water
E. None of the above/More than one of the above
Answer. A

14. The device to measure electric current is
A. voltmeter
B. ammeter
C. voltameter
D. potentiometer
E. None of the above/More than one of the above
Answer. B

15. The main component of greenhouse gases is
A. carbon dioxide
B. methane nitrous oxide
D. ozone
E. None of the above/More than one of the above
Answer. E